• 한국항만학회지
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• 제14권3호
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• pp.373-378
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• 2000

Oil spill in sea water is the most frequent and significant problem of marine pollution. As an early detection sensor of the pollution, an activated carbon coated quartz crystal is prepared and examined for its performance of detection sensitivity and stability. Powdered activated carbon and phenol resin is coated on the surface of the sensor and the sensor is baked for an hour. Adsorption of acetone dissolved in water and salt water is measured using frequency shift of quartz crystal at different concentrations of solute material. The outcome indicates that the sensor preparation is adequate and the measurement of solute concentration is stable and sensitive enough to be implemented on the monitoring of solute concentration is stable and sensitive enough to be implemented in the monitoring of organic pollution of sea water.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회
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• pp.404-415
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• 2010

In this paper, using the TDR sensors, variation of soil water content changes were measured as TDR data. Then filtering technique was determined using Fourier transform. Determine the moisture content of soil and ground water level and tried to determine unsaturated zone. First, variation of water content changes were measured TDR data by indoor experiment. Then as a function of TDR data made for water content of soil. Next, through Acrylic indoor laboratory model experiments, changes in ground water levels and lateral penetration of the field conditions were reproduced in an indoor. Field applicability of the TDR sensor was demonstrated by analysis of this. TDR sensor was installed in the embankment, TDR data were measured by TDR sensor.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.171-178
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• 2006

In advanced countries, state-of-the-art temperature monitoring technique is widely used for effective use of geothermal resources. But these kind of modern tools such as Thermal Line Sensor has not been applied to find geothermal characteristics of alluvium and riverbed in domestic area. In this research, state-of-the-art thermal line temperature sensor monitoring was introduced. And long term field test using this type of sensor was performed to find geothermal characteristics of alluvium and riverbed and evaluate the availability for heat energy source. As a result, temperature monitoring technique through thermal line sensor was very effective to obtain basic geothermal information of alluvium deposit and riverbed. Also, it was found that the groundwater temperature phase showed its potential of utilization as a energy source of heat pump. It is estimated that further study shows a specific corelation between temperature monitoring data and its availability as a energy source.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 추계학술대회 논문집
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• pp.471-474
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• 2002

A fuel tank contains water at the bottom under the fuel. The water comes from humidity by temperature change of inside and outside of tank. So it is necessary to measure both level to check precise amount of oil. But measuring instrument for level of water and fuel is not available yet. Since the fuel is inflammable, the sensor system must not include any electric circuits in the fuel tank. Optical cable sensor can satisfy this non-explosive condition. The displacement of a float changing by water level makes bending curvature of optical cable different. As the float rise up, the optical cable is bent more and the light signal in the cable decreases. The reduction of light signal is detected and it is converted into the change of water level. The output signal from a photo diode shows the proportional relation of water level. The increase of sensor voltage as a unit of ㎷ follows the level position of the float that is located between water and gasoline in the tank.

• 인터넷정보학회논문지
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• 제11권4호
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• pp.51-58
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• 2010

본 논문에서는 USN환경에서 수질 모니터링 시스템을 설계함에 있어 센서 데이터를 효율적인 방법으로 전송하기 위한 다양한 시도를 소개한다. 대표적인 방법은 센서노드에서의 센서 매니지먼트와 싱크노드에서의 클러스터링이다. 센서 매니지먼트는 센싱 간격, 데이터 누적, 데이터 전송 등을 총괄적으로 관리하고, 클러스터링은 데이터 마이닝 기술을 접목한 효율적인 전송 데이터의 축약방법이다. 실험을 통해서 제안한 센서 매니지먼트와 클러스터링을 이용한 전송방법이 일반적인 센서 데이터 전송방법에 비해 얼마나 더 효과적인지를 확인할 수 있었다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 추계학술대회
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• pp.516-519
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• 2010

본 논문에서는 기존에 관리자가 화초가 자라는 토양에 함유된 수분의 양을 측정하여 물 공급시기를 판단하고, 그에 따라 필요시 수동으로 물을 공급해 주던 방식의 문제점을 개선하고자 제안하는 방법이다. 제안하는 시스템은 센서노드와 관리용 호스트 컴퓨터가 무선센서 네트워크로 연결된다. 계측시스템은 센서노드에 연결된 습도센서를 사용해서 흙속에 존재하는 수분의 양을 측정한다. 제어시스템은 수분의 양이 설정 값 이하로 떨어지면 솔레노이드 스위치를 제어해서 물 공급 시스템의 밸브를 자동으로 열어 일정한 수분이 공급되게 한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.95.1-95
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• 2002

<1. New level meter inside the fuel tank> Ultrasound level sensors are widely applied as level meters of liquid tank. Measurement instrument of level between water and fuel is developed. Since the fuel is inflammable, the sensor system doesn't allow to include any electric circuit inside the fuel tank. The optical cable sensor can satisfy this explosive condition. The measurement method with ultrasonic sensor is attached on the tank wall or tank manhole lid. The pressure sensor can't be applied inside the gasoline fuel tank. An ultra-sonic sensor doesn't detect a enough signal reflected from water level deep under gasoline fuel. The pressure sensor is difficult to measure the height o...

• 한국자기학회지
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• 제21권1호
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• pp.32-36
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• 2011

DC 마그네트론 스퍼터링을 이용하여 제작한 고감도 거대자기저항 스핀밸브 박막 소자를 이용하여 수위 및 수온을 측정할 수 있는 센서를 제작하였다. 제작한 센서의 수위 및 수온 분해능은 각각 $400\;m{\Omega}/mm$와 $100\;m{\Omega}/^{\circ}C$ 이었으며, 이는 전립선 비대증 KTP(potassium titanyl phosphate) 레이저 치료기에서 냉각기의 수위 및 수온을 조절하는 센서로써 응용이 가능하다.

• Current Optics and Photonics
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• 제3권3호
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• pp.199-203
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• 2019

The characteristics of a photonic crystal fiber sensor with reuleaux triangle are studied by using the finite element method. The wavelength sensitivity of the designed optical fiber sensor is related to the arc radius of the reuleaux triangle. Whether the core area is solid or liquid as well as the refractive index of the liquid core contributes to wavelength sensitivity. The simulation results show that larger arc radius leads to higher sensitivity. The sensitivity can be improved by introducing a liquid core, and higher wavelength sensitivity can be achieved with a lower refractive index liquid core. In addition, the specific channel plated with gold film is polished and then analyte is deposited on the film surface, in which case the position of the resonance peak is the same as that of the complete photonic crystal fiber with three analyte channels being filled with analyte. This means that filling process becomes convenient with equivalent performance of designed sensor. The maximum wavelength sensitivity of the sensor is 10200 nm/RIU and the resolution is $9.8{\times}10^{-6}RIU$.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2008년도 춘계종합학술대회 A
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• pp.898-901
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• 2008

센서 네트워크와 CMOS 이미지 센서를 사용하여 바이오센서 활동량을 측정할 수 있는 모듈을 개발하였다. 수중의 물벼룩, 물고기와 같이 살아있는 대부분 생물체는 수질을 모니터링 하는 바이오센서로 자주 사용된다. 바이오센서의 활동량은 수질에 의해 변화한다. 개발된 바이오센서의 측정 모듈은 기존의 장치에 쉽게 인터페이스 할 수 있다.